DOS 2018

236 · DOS Abstracts How introduction of a novel Total Knee Arthroplasty system influences surgical procedure immediately following implementation Adam Omari, Anders Troelsen, Henrik Husted, Thue Ørsnes, Niels Kristian Stahl Otte, Kirill Gromov Department of Orthopedic Surgery, Hvidovre Hospital Background: New implants for total joint arthroplasty are continuously in- troduced with the proposed benefit of increased performance and improved outcome. Little information exists on how introduction of a novel arthroplasty implant affects the surgical procedure immediately after implementation. Purpose / Aim of Study: The aim of this study was to investigate how periop- erative factors and early postoperative outcome was affected by introduction of a novel TKA system. Materials and Methods: A novel TKA system was introduced at our institu- tion in 2015. A total of 75 TKAs performed with the new system immediately following the introduction (25 TKA/ surgeon) were identified as the new group. The latest 25 TKAs performed by each surgeon prior to introduction of the new system were identified as the control group. Demographic-, intraoperative-, and alignment data was collected. Findings / Results: After introduction of the novel implant, the TKA sys- tem was utilized 69%, 53%, and 45% by the three surgeons, respectively. The control group was 4.5 years (P=0.009) younger compared to the new group showed no difference in gender, BMI, pre- operative TFA, and ASA score. Mean time of surgery and mean intra-op blood loss was increased by 28% (P=0.002) and 38% (P=0.002), respectively. In regard to alignment, femoral flexion (FF) was increased in the new group by 2.0 degrees (P<0.0001). Tibial slope (TS) was on the contrary decreased by 4.7 degrees (P<0.0001). Differences in AP- alignment of tibia, femur, and post-op TFA were non-significant. Conclusions: Introduction of a new TKA implant increased surgical time and blood loss, with only minor changes in respect to alignment. Further studies are needed to investigate if these differences persist over time and correlated to patient reported outcomes. Surgeons should express increased care when introducing new procedures. 177.